期刊
GEOPHYSICAL RESEARCH LETTERS
卷 48, 期 16, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL094622
关键词
river morphodynamics; point bar; accretion rate; sediment preservation; stratigraphic completeness; numerical model
资金
- Chevron
- CNOOC International
- ConocoPhillips
- Equinor
- Murphy Oil
- Occidental
- Saudi Aramco
- Shell
- Tullow Oil
- Woodside
- YPF
- Petrotechnical Data Systems
- Orano
- AkerBP
- BHP
- Cairn India [Vedanta]
- CNOOC International, Canada
The study used time-lapse trajectories and a numerical model to simulate the evolution of rivers, finding that sediment preservation decreases predictably with time, while accretion rates do not follow the expected power-law decay. This is interpreted as reflecting the effect of geomorphic thresholds of channel transformation and cutoff.
The way river morphodynamics influence the preservation of point-bar deposits at multiple scales is not fully understood. Employing time-lapse trajectories of natural rivers, a numerical model is used here to simulate planform evolutions of meander-belt reaches that embody different transformation behaviors and cutoff processes. Proxies for temporal durations are obtained considering the surface area over which a river migrated and channel migration rates that relate to average channel radius of curvature through constant, monotonic, and non-monotonic relationships. The preservation of meander-belt deposits over different timescales is assessed at three architectural hierarchies: (a) pairs and (b) sets of accretion packages, and (c) meander-belts. Results confirm that sediment preservation decreases in a predictable way with the accumulation time; however, accretion rates decay with time in a way that does not follow the expected power-law. This is interpreted to reflect the effect of the onset of geomorphic thresholds of channel transformation and cutoff.
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